Hi guys
Need your helping giving me some advice of string cleaners.

Which string cleaners would you suggest?

I've tried fast fret, but I didn't really like it, I didn't know when it was used up. Before that I used a spray from the local guitar shop (which they don't stock anymore) and I can't remember what it was called. This was much better as it was easy to use and apply and I knew when I needed a new one.

So any good spray string cleaners?

Thanks in advance.